Eldigan is a character from Fire Emblem: Genealogy of the Holy War. He is the commander of the Cross Knights and the lord of Agustria's House Nordion during the first generation. As a descendant of the Crusader Hezul, he wields the powerful "Demon Sword" Mystletainn.
Eldigan is extremely loyal to the Agustrian royal family, as his ancestors inadvertently inherited Hezul's Holy Blood through Hezul's daughter (who was married off to Nordion). They thus swore to utilize the powers of the Mystletainn to protect the royal family.